Means for overcoming dead-centers.



No. 801,493. PATENTED OOT.10,1905. J. WHITTINGTON. MEANS FOR OVERCOMINGDEAD CENTERS.

APPLICATION FILED JULY 30, 1904 2 SHEETSSHEET 1,

I mum" wllillll M- in A lllllll or PATBNTED OCT.10, 1905.

am an E T N E C m N E ND nu m I TM HO m WE V JO R 0 F S N A B MAPPLICATION FILED JULY 30. 1904.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

JAMES WVHITTINGTON, OF BAKER CITY, OREGON. ASSIGNOR OF THREE- FOURTHS TOHYRUM H. SALISBURY. JAMES ZENAR, AND IV. A. HIRSOH,

OF BAKER CITY, OREGON.

Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed July 30, 1904. Serial 218,921.

To all whom it Hui/y concern:

Be it known that I, JAMES I/VHITTINGTON,

a citizen of the United States, residing at 1 Baker City, in the countyof Baker and State 1 of Oregon, have invented certain new and usefulImprovements in Means for Overcoming Dead-Centers, of which thefollowing is a specification.

This invention relates to power-translating mechanism, and has for itsobject to devise novel means for overcoming dead-centers withoutmaterially detracting from the power expended to drive the part 'ormechanism to be operated.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand accompanying drawings.

While the invention may be adapted to different forms and conditions bychanges in the structure and minor details without de parting from thespirit or essential features thereof, still the preferred embodimentthereof is shown in the accompanying drawings, in which Figure 1 is aperspective view of a powertranslating mechanism embodying theinvention. Fig. 2 is a side view thereof, a portion of one of the leversbeing broken away. Fig. 3 is a sectional view of the driven shaft andthe proximal end portion of the frame, on a larger scale, showing inelevation the parts intimately associated therewith. Fig. 1 is a frontview of the end portion of the mechanism illustrated in Fig. 3.

Corresponding and like parts are referred to in the followin descriptionand indicated in all the views of the drawings by the same referencecharacters.

The exact mounting of the mechanism to which the invention is appliedand which includes the several shafts .is immaterial in thecontemplation of the invention. However, specifically describing theconstruction illus trated, the driven shaft 2 is preferably mounted insuitable bearings at one end of a frame 1, the motor or engine shaft 3being mounted in bearings at the opposite end of said frame. A support 1projects from the end portion of the frame carrying the motor-shaft 3,and two shafts 5 and 6 are mounted thereon.

f Sprocket-wheels 7 are fast upon the shafts 5 l and 6 and are connectedby chain belts 8. A sprocket-wheel 9, secured to the shaft 6, isconnected by sprocket-chain 10 to a corresponding sprocket-wheel 11 onthe shaft 3, which is adapted to be drawn by any suitable power.

Levers 12 are utilized to transmit motion from the belts 8 to the drivenshaft 2 and are fulorumed near one end upon a shaft 13, mounted insuitable bearings carried by the end portion of the frame 1, supportingthe shaft 2. The levers 12 have telescoping end sections 15, which areconnected with the chain belts S and operate in openings 14 at the endsof the levers adjacent to said chain belts. The ends of the levers 12opposite those provided with the telescoping sections 14 have a pitmanconnection with the driven shaft 2, pitmen 16 being used to connect saidlevers with wrist -pins 17 of. wheels 18, fast upon the end portions ofthe shaft 2. In order that power may be taken from the driven shaft 2, apulley 19 is secured thereto.

In order to admit of a free and uninterrupted rotation of the shaft 2and prevent the wrist-pins 17 from hanging on a deadcenter, yieldingpressure devices are provided with the pitmen 16. These yielding devicescomprise standards 20, pivoted to arms 21, extended from the frame 1,said standards being provided with rollers or idlers 22, normally heldin contact with the said pitmen 16. Springs 23 bear against thestandards 20 to hold them in engagement with the pitmen. It will beunderstood that the springs 23 may be of any suitable type, thoseillustrated being of flat form.

hen the chain bolts 8 are actuated by power transmitted to themotor-shaft 3, rectilinear movement is imparted to the adjacent ends ofthe telescoping sections 14 of the levers 12 and impart an oscillatorymovement to said levers which is converted into a rotary motion by meansof the pitmen 16 and their crank connection with the shaft 2. As thewrist pins 17 approach the deadpoints the springs 23 are subjected to anincreased tension, which is utilized to carry the said wrist-pins pastthe dead-centers, the power expended to compress the springs being againutilized to operate the levers in the for positive engagement andcooperationv transmission of power from the power-driven shaft 3 to thedriven shaft 2.

Having thus described the invention, what is claimed as new is In adevice of the class described, the combination of a supporting-frame,levers mounted upon the said frame, means for imparting an alternateoscillatory movement to the said levers, a driven shaft, pitmenconnecting corresponding ends of the levers with the driven shaft foractuation thereof, standards pivoted to the frame, rollers carried bysaidv standards and in direct engagement with the said pitmen, andsprings mounted upon the frame and bearing against the pivoted stand- I5 ards to hold their rollers in contact with the pitmen for the purposespecified.

In testimony whereof I affix my signature in presence of two Witnesses.

JAMES WHITTINGTON.

Witnesses:

F. H. ATKINSON, J. E. HYDE.

